GB368337A - Improvements in or relating to high frequency transmitters - Google Patents
Improvements in or relating to high frequency transmittersInfo
- Publication number
- GB368337A GB368337A GB36322/30A GB3632230A GB368337A GB 368337 A GB368337 A GB 368337A GB 36322/30 A GB36322/30 A GB 36322/30A GB 3632230 A GB3632230 A GB 3632230A GB 368337 A GB368337 A GB 368337A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- plate
- signals
- valve
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000006096 absorbing agent Substances 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 230000011664 signaling Effects 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C1/00—Amplitude modulation
- H03C1/62—Modulators in which amplitude of carrier component in output is dependent upon strength of modulating signal, e.g. no carrier output when no modulating signal is present
Landscapes
- Amplifiers (AREA)
- Transmitters (AREA)
Abstract
368,337. Wireless transmitting apparatus. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, London, and GREEN, E., Penrose, Long Stomps, Chelmsford. Dec. 2, 1930, No. 36322. [Class 40 (v).] A radio or like transmitter is rendered active and inactive under the control of speech or other signals by means of a rectifier containing a resistance-capacity combination in its output circuit, the voltage across which controls an absorber valve serving to divert anode feed current from one or more of the high-frequency amplifiers. Speech or other signals are applied to the grids of valves V1, V2, and the amplified signal current passes on the one hand to the modulator via the transformer T1, and on the other hand through a potentiometer R1, R2 and transformer T2 to a pair of choke-capacity coupled amplifiers V3, V4. The output from the valve V4 is rectified by a valve V5 and charges a resistance-shunted capacity C4. The presence of signals causes the upper plate of the condenser C4 to acquire a negative charge, and raises the internal resistance of the subsequent valves V6, V7, and owing to the external plate resistance R5, the plate voltage rises. The rise in voltage is communicated through a battery B2 to the grids of further valves V8, V9 which then pass plate current from a high-voltage source HT2 through resistance R6. Their plates become less positive, and a fraction of this voltage fall (determined by the resistances R7, R8 and battery B3) is applied to the grid of the final valve V10 cutting off the plate current through this valve. A resistance R9 in the plate circuit is also in the plate supply circuit DL of the radio transmitter, which is thus brought into action when signals are present, and is inoperative when signals are absent. The suppression of the carrier during non-signalling periods eliminates singing round the circuit and prevents undue interference with adjacent receiving apparatus, particularly in ship installations.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB36322/30A GB368337A (en) | 1930-12-02 | 1930-12-02 | Improvements in or relating to high frequency transmitters |
| US578383A US1958994A (en) | 1930-12-02 | 1931-12-01 | High frequency transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB36322/30A GB368337A (en) | 1930-12-02 | 1930-12-02 | Improvements in or relating to high frequency transmitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB368337A true GB368337A (en) | 1932-03-02 |
Family
ID=10387074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB36322/30A Expired GB368337A (en) | 1930-12-02 | 1930-12-02 | Improvements in or relating to high frequency transmitters |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US1958994A (en) |
| GB (1) | GB368337A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL68134C (en) * | 1942-03-24 | |||
| NL289308A (en) * | 1962-02-21 | |||
| US4286336A (en) * | 1979-02-08 | 1981-08-25 | Rca Corporation | Automatic shutdown arrangement for stand-alone television modulator |
-
1930
- 1930-12-02 GB GB36322/30A patent/GB368337A/en not_active Expired
-
1931
- 1931-12-01 US US578383A patent/US1958994A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US1958994A (en) | 1934-05-15 |
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